In addition to the school hill, I visited a park that's seen in the Clannad anime in Mizuho. This one is called Sayamaike park and it's even closer to Hakonegasaki Station than the school hill is.
Image from Episode 8 - 18m19s
There's a path just in front of the bushes shown in the anime so I stood there to take this picture instead of sneaking behind them.
Image from Episode 8 - 18m21s
The only thing that doesn't match is the sign that may or may not have been put up after the anime was made.
Image from Episode 8 - 19m16s
There were a lot of people fishing in this park on the day I visited.
Image from Episode 8 - 19m29s
So instead of Tomoya and Nagisa you get people fishing in this match shot. ^_^
Image from Episode 12 - 19m00s
The park bench were Tomoya and the mysterious man had a talk.
Image from After Story Episode 6 - 11m37s
This park is also seen in After Story.
Japanese Clannad After Story volume 4 DVD cover
This little shop shown on the cover of the fourth DVD volume of After Story in Japan is right next to the park.
Image from Episode 11 - 08m43s
Here's a bonus image. A lot of Japanese towns have their own fancy manhole covers. This is the Mizuho town one and even this is replicated in the anime.
This location was visited on 2014/04/13.
Mizuho official website
Special thanks to the ones who went here before: